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Crazy Grass

I'm trying to figure out what kind of grass is taking over my yard. I thought it might be poa annua or some kind of crab grass, but I don't know if it is. The grass grows over the top of my centipede grass. It runs like crazy and it's kind of bluish-green in color. It grows out over my sidewalk very quickly after cutting. Do you have any idea what kind of grass this could be? If so, how do I get rid of it? The lawn is in Mt. Pleasant, SC.